Anonymous functions in R Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an anonymous function that adds 5 to its input.

R Programming

add_five <- function(x) [1] x + 5
add_five(10)

Drag options to blanks, or click blank then click option'

Afunction(x)

Bfunction()

Cfunction(y)

Dfunction(x, y)

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function without parameters like function()

Using a different parameter name than x

The anonymous function must take one argument x and add 5 to it.

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medium

Complete the code to apply an anonymous function that squares each element in the vector.

R Programming

squared <- sapply(c(1, 2, 3), [1](x) x^2)
squared

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Afunction()

Bfunction(x)

Cfunction(y)

Dfunction(z)

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function without parameters

Using a parameter name not matching the function argument

The anonymous function must take one argument x and return its square.

3fill in blank

hard

Fix the error in the anonymous function that multiplies input by 3.

R Programming

triple <- [1](x) x * 3
triple(4)

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Afunction x

Bfunc(x)

Cfunction(x)

Dfun(x)

Attempts:

3 left

💡 Hint

Common Mistakes

Missing parentheses after function keyword

Using incorrect keywords like func or fun

The correct syntax to define an anonymous function is function(x).

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hard

Fill both blanks to create an anonymous function that returns TRUE if input is greater than 10.

R Programming

check_gt_10 <- [1](x) x [2] 10
check_gt_10(15)

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Afunction

Bif

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using if instead of function to define the function

Using the wrong comparison operator

The function keyword defines the anonymous function, and the operator > checks if x is greater than 10.

5fill in blank

hard

Fill all three blanks to create a list of squares for numbers greater than 3 using an anonymous function.

R Programming

result <- lapply(1:5, [1](num) if (num [2] 3) [3] num^2 else NULL)
result

Drag options to blanks, or click blank then click option'

Afunction

B>

Creturn

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using if instead of function to define the function

Using < instead of > for comparison

Omitting the return keyword

The anonymous function is defined with function, uses > to check if the number is greater than 3, and return to output the square.